object ScalaTypeDemo01 {

  def main(args: Array[String]): Unit = {
    var num: Int = 10
    println(num.toDouble + "\n" + num.toString + "\n" + 10.toString)

    var isPass = true
    println(isPass.toString)

    SayHi()
    SayHi

  }

  def SayHi(): Unit = {
    println("say hi~")
  }

}
